Grinding machine



EAQLQZZ WEE 29, 1924.

H. M. ROCKWELL GRINDING MACHINE 1917 5 Sheets-Sheet 1 Orial Filed Jan.10

IN V EN TOR. W

ATTORNEY.

' H. M. ROCKWELL GRINDING MACHINE TTOR NE Y.

Original Filed Jan. 10 9%?615-5118812 2 Aprii 29 1924.

H. M. ROCKWELL GRINDING MACHINE 5 Sheets-Sheet 5 Original Filed Jan. 10.1917 INVENTOR.

A TTOR NE Y.

GRINDING MACHINE Original Filed Jan. 10, 1917 5 Sheets-$heet 4 IN ENTOR.-1

Aprii 29', 1924. v

H. M. ROCKWELL GRINDING MACHINE Original Filed Jan. 10 1917 5Sheets-Sheet 5 INVENTOR. 0%[2 ATTORNEY.

Patented pr. 29, 1924.

i sras HUGH M. ROCKWELL, OF BRISTOL, CONNECTICUT, ASSIGNOR, BY MESNEASSIGNMENTS,

TO STANDARD STEEL AND BEARINGS INCORPORATED, OF WILMINGTON, DELA- WARE,A CORPORATION OF DELAWARE.

GRINDING MACHINE.

Application filed January 10, 1917, Serial 80.141307. Eenewed September21, 1928.

To a]! whom it may concern.-

Be it known that I, HUGH M. Booxwmm, a citizen of the United States, anda resident of Bristol, in the county of Hartford and State ofConnecticut, have invented a new and Improved Grinding Machine, of whichthe following is a specification. My invention relates to the class ofmachines that are used to give articles the proper shape as to size,form, dimensions,

' &c., and an object of my invention, among fit others, is to provide asimple and durable machine that shall be extremely accurate in thecharacter of work produced by it.

A form of machine in the construction and use of which the objectsherein set out, as well as others, may be attained, is illustrated inthe accompanying drawings, in which- Figure 1 is a view in frontelevation of a machine embodying my invention, with the closing plate ofthe casing removed.

Figure 2 1s a view, scale enlarged,'in central vertical section throughthe upper part of my improved machine, and with parts broken away toshow construction.

l igure 3 is a view in cross section through the machine on planedenoted by dotted line 33 of Figure 2.

Figure 4 is a view in end elevation, looking from the left withrespectto the plane of view of Figure 1, and with parts broken away toshow construction.

The scale of Figures 3 and 4 is the same as that of Figure 2.

Figure 5 is a detail view in cross section through the upper portion ofthe case on plane denoted by dotted line 5--5 of Figure 2.

Figure 6 is a detail bottom view illustrating. the reversing frame andits support.

Figure 7 is a detail view in cross section through a portion of the bedof the machine on plane denoted by dotted line 77 of Figure 1.

My improved machine is especially adapted for cutting away a portion ofmetallic articles for the purpose of giving them correct size, shape.&c., a grinder or grinding tool being made use of for the purpose ofeffecting the cutting operation, and as my improved machine isespecially adapted for operating upon metallic articles of annular form,the machine is illustrated and described herein as arranged to operateupon the casing forming a part of ball bearings.

In the accompanying drawings the numeral 10 indicates a standard, of anysuitable construction, supporting a table 11, preferably of pan shapeand within or upon which the operative arts of the machine are located.The tabl bolted to the standard or otherwise secured thereto in anysuitable manner. It has a bearing in the lower side thereof for a rockshaft 12, and a guide 13 and a rest 14 rise from the bottom of the panin position to guide and ing frame in its sliding movement. A flange 15also rises from the bottom of the pan to form an inclosure and prevententrance of objectionable matter to working parts of the device.

The work supporting frame is located at one end of the pan and will bespecifically hereinafter described. The tool supporting frame is locatedat the opposite end of the pan and comprises a base 16 having a guiderib 17 extending into a guide 18 rising from the pan, said base alsobeing supported on a rest 19 also rising from the bottom of the pan. Arock shaft 20 has a pinion engaging a rack 21 projecting from the underside of said base and by means of which rock shaft, pinion and rack thebase is moved laterally of the machine. A threaded. stop shaft 22mounted in the sides of the pan has a nut to engage a stop 92 on thebase 16 and limit its lateral movement in one direction. This nut isadjustably mounted on the shaft in any manner that will readily suggestitself -to the skilled mechanic. The base 16 supports a motor 23, hereinshown as an electric 7 32 and by which the flow of electricity through awire 33 to a motor 34 located at the other end ofthe pan is controlled.A ball 35 is located at the end of an arm 36 secured to the rock shaft20, this weight being so located that it will normally press the lug 92on the base 16 against the nut,

support the work supporte or pan- 11 may be the latter being manuallymoved by a wheel 115 to effect the feeding of'the grinder laterally upto a piece of work, and by the term work as employed herein is meant thearticle that is being reduced by the grinder to proper shape, size orotherwise formed by the grinder.

The work supporting frame comprises a base 37 located .within the panand having a lip 38 projecting downwardly below the plane of the upperedge of the flange 15 to assist in preventing objectionable matter fromentering the inclosure within said flange. A pinion 39 on the shaft 12engages a rack 40 on the base 37, and the shaft 12 has an arm 41 securedto it and bearing a ball or weight 42 by means of which the shaft isoperated to impart a reciprocating movement to the work supporting framelongitudinally with respect to the work supporting spindle and towardand from the grinder, the weight yieldingly holding said frame at thelimits of such reciprocating movement. A casing 43 rises from the base37 and has openings 44-45 in its end Walls and holes in its front andrear walls, the hole 46 in the front 'wall being closed by a plate 47and the hole in the rear wall being closed by a plate. 48.

A work supporting spindle 49 is mounted for longitudinal and rotarymovement in bushings in the openings 44- 45 in the end walls, thisspindle having'a groove 50 at one end to receive a spline 51 secured toand projecting from theface of a driving worm wheel 52 mounted on a wormsupport 53 comprising an extension from the bushing in the hole 45 inthe rear wall of the casing. This worm wheel 52 meshes with a drivingworm 54 connected with the shaft of the motor 34. The work supportingspindle is rotated by means of the mechanism just described. Saidspindle receives a longitudinal reciprocatingmovement by means ofthreads alternately meshing with threaded blocks. In the constructionherein shown-7 the spindle 49 turns to .the left and the thread 55operates to move the spindle to ward the grinder and the thread 56 opcrates to move the spindle in the reverse direction and by means thatwill presently be described, said threads being forward and backwardfeed threads.

In order to obtain the greatest accuracy in operation of the machine,the parts are constructed to insure a minimum amount of vibration beingtransmitted to the work supporting spindle. The threads 55 and 56 are,therefore, supported independently from and clear of said spindle, sothat the shocks incident to alternate engagement of threaded blocks withsaid threads are not transmitted to the spindle. A sleeve 57 havmg anopening therethrough larger than the splndle 49 13 supported in anopening through a bracket secured to and depending from a bar 58,mounted in the casing. In the construction shown this bracket comri sestwo branches 5960, the branch 60 eing shorter than the branch 59 andbeing formed by a spect to the ranch 59 and encircling the bar 58, asshown in Figure 5 of the drawings. The branch 59 envelops the sleeve 57on one side and a cap plate 61, a counterpart of a portion of the branch59 cnvelops the side of the sleeve on the side opposite the branch 59,this cap plate being secured to said branch as by means of screws, thebranch 60 of the bracket also being secured to the branch 59 as by meansof screws that tightly clamp the bracket in place on the bar 58 so thatthe sleeve 57 will not touch the spindle 49 at any point, but may freelvrotate within said bracket. This sleeve is p)art bent backwardly withre- 7 connected to rotate with the work supporting spindle as by meansof a plunger 62 seated upon a spring in a recess in the spindle as shownin Figure 2 of the drawings, the reduced end of this plunger engaging anopening 63 in the threaded sleeve. It will thus be seen that theconnection between the spindle and the sleeve is so small as to impartbut little vibration from one to the other. A rack 64 is formed on thelower edge of one member of said bracket, preferably the member 59.

One end of the bar 58 extends into a rocking sleeve 65 mounted forrocking movement in a hole above the opening 45 in the rear wall of thecasing. A hub at one end of a reversing frame is mounted upon the end ofi this sleeve that projects into the casing, and a hub at the oppositeend of the frame is mounted upon the bar, said frame being located atthe upper end of the chamber in the casing. This frame consists of thehubs 66 -67 and cross bars 68 connecting the hubs, the hub 66 beingsplit on.one side and having a clamp screw 69 extending through thesplit portion as a means of securing the reversing frame to the sleeve65. Arms 70 extend downwardly from the cross bars and have at theirlower ends threaded blocks 71 each of which blocks is provided with athread to engage one of the threads 55 or 56 on the sleeve 57. Themembers of this frame, in the construction herein shown, are integraleach with the other, and reversing frame actuating lugs 72 areadjustably secured to the blocks .71v as by means of studs passingthrough slots 73 in the blocks and secured in place as by means of nuts,as shown in Figure 1 of the drawings. These lugs are located in positionto encounter reversing cams 74 formed at opposite ends of the sleeve57and by means of which the re menoaa the threads 55 and 56. Anactuating arm 75 extends from the sleeve 65 and. projects over anactuating cam 76 mounted on a cover 77 secured to the casing at one end,thiscam comprising'a plate removably secured to the casing. An actuatingplunger 78 is mounted in a recess in the overhanging part of thedownward causes movement of the reversing frame and completes suchmovement, a lug 72 in this completion of the movement being carried awayfrom a cam74.

The spindle 49 is provided with a plate to which a work holding chuck149 or other desirable tool may be attached, a. general description ofwhich hereinafter appears. In some cases it is desirable to move thespindle by manual operation. and for this purpose an operating shaft 81is mounted at one end in and extends through the plate 47 and bearinghub 82 thereon and through an opening in the lower edge of a guide plate83 secured to a gulde 84 pro ecting from the rear wall of the casing,said guide having an opening 85 to receive a pinion 86 on the end of theshaft 81. A spring 87, thrusting at one end against the plate 47 and atits other end against a shoulder on the shaft, forces the pinion 86normally. from engagement with the rack 64, and as shown in Figure 3 ofthe drawings. When it is desired to manually move the spindle 49longitudinally the reversing frame will be placed in its central orneutral position, as by moving the arm 75 to its central position andturning the plunger 78 into a position at right angles from that shownin Figure 4 and causing the ridge of the plunger, which is of somelength, to rest upon the ridge of the cam, but extending across it sothat the plunger will remain in this position. The handle 88 beingpulled outwardly the pinion 86 will be engaged with the rack 64 and thespindle may then be moved longitudinally by turning the handle that ispulled outward to retain the pinion in engagement withthe rack duringthis operation. Upon releasing the force applied to the handle thespring 87 will return the parts to their normal position shown in Figure3 and the handle will be en ge-d with a locking lug 89 on the plate 4%.It will be noted that the plates 47 and 48 are re- In operation, one ofthe nection.

movably held in place as by meanstofthumb nuts and threaded lugs. In oneoperation this manual movement of the spindle 49 made use of to dressthe grindingwheel, a suitable tool being held in the chuck or at tachedto the plate 80 and the grinding wheel being rotated, the shaft 49 ismoved longitudinally to carry the dressing tool across the face of thegrinding wheel. The guide 84 iscut-away at its upper front edge as at 90to form with the plate 83 a guide groove to receive the rack 64. Thisguide plate is yieldingly held in place as by means of spring washers91, these washers having arms that press yieldingly against the plate,and screws or other suitable means for securing thewashers in place areemployed. This construction causes the guide plate 83 to exert a slightyielding pressure against the rack 6 The rack 64. in addition to itsfunction in the operation of moving the sleeve 57 and spindle 49lengthwise, also performs a very important feature in its function as aguide. In this latter case it so guides the sleeve 57 in its movementwith the spindle 49 that the sleeve and spindle are always held fromcontact one with the other. The covers 77 and 93 are secured to theendsof the casing and are provided with recesses and with suitablewashers-to receive the ends of the bars and shafts and to prevent theentry of injurious matter, as dust, dirt, and the like, into thebearings and into the case. A tube 94 extends through this spindle49 tosupply lubricating material to the work being performed on the machine,this tube being fed from a pipe 95 extending to any suitable source ofsupply.

A stop screw -support 96 projects outwardly from the front of the casingat its lower end (see Figure 1) and this support receives a stop screw97 that is provided with stops 98 that may be adjustedalong the screw asby means of interengaging screw thread upon said parts. In operationthese stops are positioned on opposite sides of a stop lug 99 extendingupwardly from the bottom of the pan 11, as shown in Figure 3, and theposition of these stops will, by contact with the lug 99, determine theextent of movement and the zone of such move ment in the operation ofplacing the work held by the spindle 49 in position for operation of thecutting or grinding tool and in removing it from such position.

The connection between the motor shaft 100 and the shaft of the drivingworm 54 is a yielding connection and consists of discs 101102 secured tosaid shafts respectively nected by springs '105. This construction willcompensate for any slight difference in alinement of the worm and motorshafts, and also provides for a yielding driving conand havingpostsl03104 respectiv ly con- 2 The chuck 106 as herein illustrated comprisesa back plate 107 that is secured to the chuck plate 80 as by means ofbolts so arranged that the chuck may be adjustably placed in differentpositions upon said plate. As herein shown these bolts are threaded intothe back plate 107 and pass through enlarged holes 108 in the chuckplate that enables the chuck to be shifted into any desired position.The heads of the bolts rest against the back of the chuck plate and theyare threaded into the back plate 107 and any suitable number of boltsand holes may be employed. A face orvclamp plate 109 is secured to theback plate as by means of interengaging screw threads, this plate having on its inner surface an annular lip 110 to engage the work and holdit against the back plate, an opening 111 in the face plate permittingaccess of the tool for operation on the work held within the chuck. Theback plate 107 is recessed as at 112 to permit free access of thegrinder tool to the work being operated upon.

The shaft 22 hercinbefore referred to as a stop shaft, is also a feedshaft and the nut hereinbefore mentioned is threaded upon this shaft.This feed nut 113 is prevented from turning movement as by means of oneof its sides resting in sliding contact with a nut holding lug 114rising from the bottom of the pan 11. After a piece of work has beenfinished the base 16 is manually shifted by the operation of the weight35, arm 36, and shaft 20 to position the grinder free from interferencewith the placing of a new piece of work in the chuck. After such pieceof work has been so placed the weight 35 is shifted to theposition'shown in Figure 7 ofthe drawings, the stop 92 striking the nut113. The weight 42 is now operated to move the base 37 toward thegrinder and position the work held in the chuck in closer proximity tosaid grinder. The hand wheel 115 secured to the shaft 22 is nowmannually operated to cause the base 16 to move laterally in a directionto feed the grinder 29 toward the work and effect cutting operationthereon, a gage (not shown) that may be of any common construction andsupported upon an arm 116 secured to the end of the bar 58, denotingwhen the work has been cut away to the desired extent. When this cuttingoperation is completed the wheel 115 is operated to move the nut in adirection to carry the grinder 29 clear of the piece of work, the weight42 being now operated to move the chuck away from the piece of work andthe weight 35 being thrown to move the grinder back out of the way, ashereinbefore described. The grinder 29 may be fed against the work,after the grinder and work have been placed in approximate cuttingrelation, by operating the wheel 115 to draw the nut 113 toward saidwheel, thereby allowing the force exerted by the ball 35 on the base 16through the medium of the shaft 20, its pinion and the rack 21, to pressthe grinder against the work, or by turning the wheel 115 in the opposite direction to move the base 16 against the force. exerted by theweight 35 and-thus bring the grinder into contact with the to take upany lost motion due to wear be-' tween the parts, as such adjustmentwill be gradually effected in the regular operation of the machine justabove described.

The covers 77 and 93 may be secured to the casing in any desired manneras by means of screws and each is formed to provide a chamber that willact to intercept dust and dirt and collect the same, thus preventing alarge portion thereof from entering the case 43. As an additional meansof preventing this entry of dust and dirt into the case 43 the dirtintercepting chamber 117 in the cover 93 contains dust washers-118surrounding the bar 58 and the spindle 49, these washers being of anydesired form and construction. The cover 77 containing the dustintercepting chamber 119 also acts as a shield or housing for the wormwheel 52,

the worm 54, and the projecting end of the spindle 49 that is located ina chamber 120 in a projection 121 from the face of said cover.

In the operation of the machine herein specifically shownand describedthe cutting grinder 29 is rotated by the motor 23 and is moved intocontact with and out of contact from the work by means of the base 16,as hereinbefore described. The motor 34 through the worm 54 and wormwheel 52 imparts rotation to the spindle 49, the rate or direction ofrotation being such as to cause a relative rotative movement between thework and the grinder. This rotation of the spindle, through theconnecting plunger 62,

imparts rotation to the reversing sleeve 57, thethreaded ends of which,by engagement with one or the other of the threaded feed blocks 71,gives to the spindle 49 a reciproeating movement endwise to. traversethe work across the face of the grinder.

The rocking movement of the reversing frame is caused by contact of oneof the reversing cams 74 with one of the lugs 72, said lugs beingpositioned and the cams being so located and shaped as to effect therocking movement of the reversing frame to impart the desired traversedmovement of the work across the grinder, and,'as hereinbefore described,the shocks incident to the sudden stopping of the reversing frame at theend of each forward and backward movement thereof in its rockingmovement, are reduced to a minimum.

In accordance with the provisions of the patent statutes, I havedescribed the principles of operation of my invention, together with theapparatus which I now consider to represent the best embodiment thereof;but I desire to have it understood that the apparatus shown is onlyillustrative, and that the invention can be carried out by other means.

It will be noted that the spindle 49 has both a rotative and alongitudinal movement in its bearings and this is particularly effectivein preventing the tool from giving a tapered shape to a piece of workbeing operated upon. In order to produce accurate work it is essentialthat the supporting members,- both for the tools and the work, andespecially the latter, shall be as free as possible from vibration andshall, therefore, have an extremely steady action. To effect thispurpose, in addition to the mechanism lu-reinbefore described, I connectthe driving means for the spindle 49 and said spindie by means of a wormand worm Wheel which impart a very steady movement to the spindle andreduces the vibration to a minimum.

I claim- 1. A work holder and a reducing tool supported in cooperativerelation, means for positioning said members in closer relation by amovement in one direction, means for placing them in cooperative cuttingrelation by a movement in another direction, a stop to limit said lastmentioned movement, means for forcing said members toward each otherfrom the last named position, and means for moving said stop. relativeto said last named means to permit said force to iict and cause cuttingoperation of said too 2. A work holder and a reducing tool supported incooperative relation, means for placing said members in closer relation,means for moving said tool toward the holder, :1 stop to limit suchmovement, means exerting force upon the tool to move it from said lastnamed position toward the holder, and means for moving said stoprelative to said last-named means to permit said force to act to causecutting operation of said tool. c

A work holder and a reducing tool supported in cooperative relation,means for moving the tool and holder in different directions to placethem in approximate cutting relation, means exerting force on one ofsaid members to move it toward the other, a stop to limit such movement,and means for movingsaid stop to permit the tool to engage a piece ofwork carried by said holder.

4. A work holder and a reducing'tool supported in cooperative relation,means for moving the tool to bring the tool and holder into closerrelation, means for moving the holder to bring said members intoapproximate cutting relation, means exerting force on one of saidmembersto move it toward the other, a stop to limit such movement, and meansfor moving said stop to permit the tool to engage a piece of workcarried by said holder.

5. A work holder; and a reducing tool sup ported in cooperativerelation, means for moving the tool and holder in difierent di+ rectionsto place them in approximate cuttin relation, means exerting force onthe too to move it toward the holder, a stop to limit such movement, andmeans for moving said stop to permit the tool to engage a piece of workcarried by said holder.

.6. A work holder and a reducing tool supported in cooperative relation,means for moving the tool to bring the tool and holder into closerrelation, means for moving the holder to bring said members intoapproximate cuttin relation, means exerting force on the too to move ittoward the holder, a stop to limit such movement, and means for movingsaid stop to permit the tool to engage a piece of work carried by saidholder.

7. A. work holder and a reducing tool supported in cooperative relation,a base move ably mounted and supporting one of said members, a rockshaft engaging said base to move it, means to exert force upon saidshaft to rock it, a stop to limit movement of said base, and means to]move said stop to permit said force to act to move the base.

8. A work holder and a reducing tool supported in coo erative relation,a base supporting each 0 said members, means for moving one of saidbases to bring said members into closer relation, means for moving oneof said bases to position said members in approximate cuttmg relation,gravity actuated means exerting force upon one of said bases to forcesaid members into closer relation, and means to permit action of saidforce to efiect cutting operation of said tool.

9. Awork holder and. a reducing tool supported in cooperative relation,bases supporting each of said members, means for moving one of saidbases to position said members in closer relation, means for positioningsaid members in approximate cutting relation, a stop to limit thelastnamed movement, means exerting force upon one of said bases to move saidparts toward each other, and means for moving said stop to permit saidforce to act to effect cutting operation of said tool.

10. A work holder and a reducing tool supported in cooperative relation,a base supporting each of said members, means for moving the holder basetoward the tool base to bring the holder and tool into closer relation,means for moving the tool base to bring said parts into approximatecutting relation, a stop to limit said movement of the tool base, andmeans for moving said stop to brin the tool into cutting action.

11. A wor holder and a reducing tool supported 'in cooperative relation,bases supporting each of said tools, means for moving the holder basetoward the tool base, a rock shaft operatively connected with the toolbase to move the tool toward the holder, means exerting force upon saidshaft to force the tool toward the holder, a stop to limit the movementof the tool toward the holder, and means for moving said stop to permitaction of said force to cause operation of said tool.

12. A work holder and a reducing tool supported in cooperative relation,a support for said tool, means for positioning said parts in closerrelation, a rack rigidly connected with the tool support, a rock shafthaving a pinion engaging said rack, a weighted arm. secured to saidshaft, a stop to engage the tool support and limit its movement, andmeans for moving the stop to permit cutting action of the tool.

13. A work holder and a reducing tool sup orted in cooperative relation,a motor to rive each of said members, means for moving. one of saidmembers with respect to the other member, and means connected to beoperated by the movement of said member to control the operation of themotor for driving the other member.

14. A work holder and a reducing tool sup orted in cooperative relation,a motor .to rive each of said members, means for moving the tool withres ect to said holder, and means connected to e operated by themovement of the cutting tool to control the operation of the motor fordriving said holder.

15. A work holder and a reducing tool supported in cooperative relation,a motor for driving each of said members, a rock shaft for moving thetool in closer engagement with said holder, a cam connected with saidrock shaft, a switch'connected to be operated by said cam, and anelectrical connection between said switch and the motor appurtenant tosaid holder.

16. A support, a member rotatably and reciprocatively mounted andbearing said support, means for rotating one of said members, and meanssupported out of contact therewith to efiect with said member butoperatively connected 7 its longitudinal movement.

17 -A support, a member rotatably and reciprocatively mounted andbearing said support, means for rotating said support, and meanssupported out of contact with said member but operatively connectedtherewith to eflect a reciprocating movement thereof in a longitudinaldirection.

18. A support, a member rotatably and reciprocatively mounted andbearingsaid support, means for rotating said member, and means supportedout of contact with said member but operatively connected therewith toeffect its longitudinal movement.

19. A support, a member rotatably and reciprocatively mounted andbearing said support, means for rotating said member, a reversing sleevesupported out of contact with said member but in driving engagementtherewith, said sleeve having means to cause longitudinal reciprocatingmovement of said member, and means to engage said sleeve to effect saidlongitudinal movement.

20. A support, a member rotatably and reciprocatively mounted andbearing said support, means for rotating said support, a reversingsleeve and a reversing member having a reversing connection includingscrew threads of different character, and said sleeve being out ofengagement with said member but operatively connected therewith, andmeans for operating the reversing mem- 21. A support, a member rotatablyand reciprocatively mounted and bearing said support, means for rotatingsaid support, a reversing sleeve surrounding said member out of contacttherewith but operatively connected thereto, said sleeve having threadsof different character, a reversing member arranged to engage saidthreads, and means for operating the reversing member to causereciprocating movement of said sleeve.

22. A support, a member rotatably and reciprocatively mounted andbearing said support, a sleeve and a rocking reversing member having areversing connection including threads of different character, and saidsleeve surrounding said member out of contact therewith but operativelyconnected thereto, and means for rocking said member to causelongitudinal movement of said sleeve by alternate action of saidthreads.

23. A support, a member rotatably and reciprocatively mounted andbearing said support, means for rotating said support, a supporting bar,a sleeve and a reversing frame having a reversing connection includingthreads of different character, said sleeve being slidably supported onsaid bar and surrounding .said member out of contact therewith butoperatively connected thereto and said frame being secured to said bar,and

means for rocking said bar to cause alternate action of said threads tocause longi tudinal movement of said sleeve.

24. A shaft rotatably and reciprocatively mounted, a sleeve surroundingsaid shaft out of contact therewith but connected for simulcarried bysaid shaft engaging said sleeve.

27 A shaft rotatably and reciprocatively mounted, a sleeve surroundingsaid shaft out of contact therewith, and a spring-pressed pin carried bysaid shaft engaging .said

- sleeve.

28. A shaft, a bearing for said shaft, said bearing having a projection,a worm wheel mounted on said projection to rotate thereon, a splinesecured to the worm wheel and projecting into' a groove in said shaft,means for rotating the worm wheelto impart rotation to said shaft, andmeans for moving the shaft longitudinally.

29. A shaft, a bearing for said shaft, said bearing having a projection,a worm wheel mounted on said projection, a spline secured to the face ofsaid wheel and projecting into a groove in said shaft, means forrotating said wheel, a sleeve surrounding said shaft out of contacttherewith but connected thereto for rotatable and-longitudinal movementtherewith, and means forcausing longitudinal movement of said sleeve.

30. A shaftrotatably and longitudinally mounted, a sleeve surroundingsaid shaft and having-screw threads of different character thereon, saidsleeve being operatively connectedwith said shaft, a rocking framebearing members to engage said threads to impart reciprocating movementto said sleeve, reversing members carried by said frame, and cams onsaid sleeve arranged to engage said rocking members to impart rock- 1ing movement to said frame.

31. A shaft rotatably and longitudinally mounted, a sleeve surroundingsaid shaft and having threads thereon extending in different directions,said sleeve being operatively connected with said shaft, a cam at eachend of the sleeve, a rocking frame,

threaded blocks upon said frame arto alternately engage the threads esleeve, and rocking members secure "to said blocks in position toalternately engage the threads on said sleeve.

32. A shaft rotatably and longitudinally mounted, a supporting bar, abracket sus-. pended from said bar and slidable thereon, a sleevesupported by said bracket and having threads running in differentdirections thereon, said sleeve being operatively connected with saidshaft, a rockin frame mounted on said bar and held against 1ongitudinalmovement thereon, means 'for rocking the bar, and means upon the frameto alternately engage the different threads upon said shaft.

33. A shaft rotatably and longitudinally mounted, a supporting bar, abracket suspended from said bar, a reversing sleeve surrounding saidshaft and su ported by said bracket, said sleeve having t reads runningindifferent directions thereon and being operatively connected with saidshaft, a

rocking sleeve forming a bearing for said bar, a reversing framerotatably mounted on said sleeve and having reversing memberstoalternately engage the different threads, and means for operating therocking sleeve.

34. A shaft rotatably and longitudinally mounted, a'bracket support, abracket longitudinally mounted on said support, a sleeve surroundingsaid shaft and supported by said bracket and having threads running indifferent directions thereon, said sleeve being operatively connectedwith said shaft, a

rocking sleeve, a rocking frame secured to .said sleeve and having meansto alternately engage said threads, an actuating cam, an

arm extending from said sleeve, a plunger mounted in said arm' normallyforced into contact with said cam, and means for imparting initialmovement to said frame.

35. A casing, a shaft rotatably and longitudinally movable therein andprojecting thereout of, means for rotating said shaft, a

threaded. sleeve located within the casing and operatively connectedwith said shaft, a slidably mounted bracket supporting said sleeve, arocking sleeve. projecting into said casing, a rocking frame locatedwithin the casing and secured to said sleeve and having means toalternately engage the threads on said threaded sleeve, and meanslocated outside of the casing for operating said rocking sleeve.

36. A casing having a chamber therein, a shaft rotatably andlongitudinally mounted in said casing and extending through saidchamber, means for rotating said shaft, a sleeve surrounding said shaftwithin said chamber and having threads extending in difierent directionsthereon, a bracket located in said chamber and supporting said sleeve, arocking frame located in said chamber, means upon said frame toalternately engage the threads on said sleeve to impart reciprocatingmovement to said chamber and secured to said frame, and means locatedoutside of the casing for operating said rocking sleeve.

37. A casing having a chamber therein, a

shaft mounted in the casing and projecting through said chamber, meansfor operating said shaft, a bar extending into said chambet and outsideof said casing, means supvice to cooperate with said holder in theoperation thereof.

38. A casing having a chamber therein, a shaft extending into saidcasingand projecting to the outsidethereof, a holder located on the endof said shaft outside of the casing, means for rotatingthe shaft, asleeve surroundingthe shaft within said chamber and having threadsextending in different directions thereon, a bar projecting from thechamber within the casing to the outside thereof, a support for saidsleeve, said support being slidably mounted upon said bar, a reversingframe mounted on the bar within the casing, and a support for a deviceto cooperate with said work holder, said support being secured to theend of the bar outside of the casing.

39. A casing having a chamber therein, a shaft rotatably mounted withinsaid casing and extending through said chamber, a work holder secured tothe shaft outside of the casing at one end thereof, driving meanssecured to said shaft outside of the casing at the opposite end thereof,a cover secured to the end of the casing and inclosing said drivingmeans, reversing mechanism operatively connected with the shaft withinthe casing, and means for operating said reversing mechanism. e

40. A casing having a chamber therein, a shaft projecting through saidchamber outside of the casing at opposite ends thereof, a work holdersecured to the projecting end of the shaft at one end of the casing,driving means secured to the shaft outside of the casing at the oppositeend from said work holder, a cover secured to the end of the easing andinclosingsaid driving means, reversing means located within said chamberand operatively connected with said shaft, and means projecting throughsaid casing and cover from said chamber to the outside of the structureand constituting a part of said reversing means.

41. A shaft rotatably and reciprocatively mounted, means for rotatingsaid shaft,'a'

sleeve having means thereon for causing reciprocating movement of saidshaft, a member to cooperate with said sleeve to effect saidreciprocating movement, means for connecting said member with anddisconnecting it from said sleeve, and means for manually sleeve havingmeans thereon for causing reciprocating movement of said shaft, a memberto cooperate with said sleeve to effect 'said reciprocating movement,means for connecting said member with and disconnect ing it from saidsleeve, a rack secured to said sleeve, and manually operated meansengaging said .rack to effect'longitudinal movement of said sleeve.

43. A casing having a chamber therein, a shaft rotatably andreciprocatively mounted Within the casing and projecting into saidchamber, means for rotating the shaft, a sleeve located within saidchamber and having means thereon for causing reciprocating movement of"said shaft, a member located within the chamber and cooperating withsaidsleeve to effect said reciprocating movement, means connecting saidmember with and disconnecting itfrom saidsleeve, a rack secured to saidsleeve, and-a manually operated member mounted in the casing andextending from the outside thereof into said chamber where it isoperatively connecteid with said rack. I

44. A shaft rotatably and reciprocatively mounted, means-for rotatingsaid shaft, a

movement thereof by the operation of a manually operated member.

45. A shaft'rotatably and reciprocatively mounted, means for rotatinsaid shaft, 'a sleeve surrounding the she and having means thereon tocause reciprocating move mentof said shaft, a support, a bracketslidably mounted on thesupport and including two parts locatedonopposite sides of the sleeve and surroundin it, means for securing thetwo parts of tie'bracket together, a rack secured between the two partsof the bracket, andmanually operated means connected with said rack toeffect movement of said sleeve.

46. A shaft rotatably and reciprocatively mounted, means for rotatingsaid shaft, a sleeve surrounding :said shaft and having means thereonfor causing reciprocating movement of said shaft, a support, a framemounted to rock on said shaft and having.

blocks depending from the frame and loreversing sleeve'surrounding saidshaft and e cated on opposite sides of said shaft to alter-' natelyengage said reversin means on the sleeve, and means for rocking saidframe to cause reciprocating movement of said sleeve,

47. A shaft rotatably and reciprocatively mounted, means for rotatingthe shaft, a sleeve surrounding the shaft and having threads thereonextending in opposite directions, a support, a rocking frame mounted onthe support, threaded blocks supported by said frame on opposite sidesof said sleeve to engage the threads thereon, cams located on saidsleeve, reversing lugs adjustably mounted in said blocks to engage saidcams, and means for rocking said frame.

48. A. shaftrotatably and reciprocativel mounted, means for rotating theshaft, a sleevesurrounding said shaft. and having threads at each endthereof'formed to provide a groove between each set of threads, asupport, a bracket slidably mounted on the support and surrounding saidsleeve within said groove, a rocking frame mounted on said support andhaving threaded members to engage the threads on said sleeve, and meansfor rocking said frame.

49. A shaft rotatably and reciprocatively mounted, means for rotatingsaid shaft, a

sleeve surrounding said shaft and having threads at opposite endsthereof forming a groove between the sets of threads, said threadsextending in different directions, a support, a two part bracketslid-ably mounted on thesupport and engaging said sleeve on oppositesides thereof and within said groove to support it, a rocking sleevesurrounding said support, a rocking frame mounted on said support and onsaid rocking sleeve, said frame having members .to enga e the threads onthe threaded sleeve to e ect reciprocating movement of the latter, andmeans secured to said rocking sleeve to operate it.

50. In combination with a cutting tool, a work supporting shaft,bearings for said shaft, means for rotating the shaft in said bearings,and means for moving the shaft longitudinally in said bearings, one ofsaid means being for positioning purposes and the other for cutting feedpurposes.

shaft,'means for rotating said shaft in said bearings, means for movingsaid shaft 1ongitudinally in said bearings. means for driving saidshaft, and "a connection between said driving means and shaft, saidconnection including a worm and Worm wheel intermeshing one with theother.

52. A work holder and a reducing tool supported in cooperative relation,means for rotating the rediuing tool, means for oooperativelypositioning. the reducing tool and work holder one with respect to theother, means for imparting a fast lateral movement to the reducing toolfor positioning purposes, and means for imparting a slow feedingmovement to said tool for cutting purposes.

53. A work holder and a reducing tool supported in cooperative relation,a member for relatively moving one of these elements 'with respect oneto the other, to place them in approximate cutting relation, and meansexerting force on said member to feed said element in the direction ofcutting movement.

M. A work holder and cutter movably mounted with respect to each other,means exerting a force upon one of said members to move it towards theother, a stop to limit such movement andmeans for moving said stoprelative to said last-named means to permit said force to effect acutting action between the cutter and a piece of work carried by saidholder.

HUGH M. ROCKWELL.

